41.反芻動物分娩時,那項內泌素(hormones)最先大量釋出以啟動分娩機制?
(A)胎兒腎上腺皮質醇(fetal adrenal corticosteroids)
(B)助孕酮(progesterone)
(C)動情素(estrogens)
(D)催產素(oxytocin)
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統計: A(1232), B(75), C(89), D(269), E(0) #1153897
統計: A(1232), B(75), C(89), D(269), E(0) #1153897